Rotary engine.



F. D. KELLY. ROTARY ENGINE. APPLIUATIQN FILED APR. 19, 1909. 326, 748, Patented July 6, 1909. ZSHEETB-EHEET 1.

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APPLIOATION FILED APR.19, 190s.

Patented July 6; 1909.

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FRANK l). Kill/LY, O1" ltltlll. VALLEY, MlNNESOTA.

ROTARY ENGINE Specification of Letters Patent.

Patented July 8, 1909.

To all i i'zom. it in (13/ concern:

it known that .1, FRANK l7. Kilian, a citizen of the United States, residing at Yliich Valley, in the county ol Dakota and State of Illinnesota, have invented certain new and useful linprovements in Rotary Engines; and i do hereby declare the l'ollowing to be a full, clear, and exact descriptioi'rol' the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to provide. an improved rotary engine, and to this end it consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

in the accompanyin drawings, which illustrate the invention, like characters indi cate like parts throughout the several views.

Referring to the drawings, Figure 1 a transverse vertical section taken on the line a" w ol Fig. 2; and Fig. 2 is a longitudinal vertical section taken on the line r" :t" ol Fig. 1.

The cylinder casting or casing 1 is provided with an internal cylindrical piston seat 2, the diameter 01 which, at its outer ends, is increased so as to term annular stop shoulders 3. The opening through the casing 1 l'ormed by the piston seat 2 is closed at each end by a detachable cylinder head 41, which is socured to the casing 1 by machine screws 5. A rectangular steam chest 6 is also formed in the upper portion of the casing 1 above the cylinder seat 2 and is provided with a detachable cover 7 secured to the casing 1 by machine screws 8 and forms a steam tight joint therewith.

Steam is supplied to the steam chest 6 from a suitable boiler, not shown, through a valve-equipped steam pipe 9. An inverted cup-shaped reversing valve 10 works over the bottom of the steam chest 6 and is provided with a valve stem 11 which works through a stulling box 12 in the left hand side of the steam chest 6 with respect to Fig. 2. The outwardly projecting end of the valve stem 11 is pivotally connected at 13 to an operating lever 14, which lever is pivotally secured, at its lower end, to a bracket 15 secured to the base of the casting 1.

A pair of parallel and laterally spaced ports 16 and 17 are formed in the casing 1. and extend approximately tangentially from opposite sides 01' the piston seat 2 (see Fig. 1) and open into the steam chest 6 on opposite sides thereol. An exhaust port 18 is also formed in the casing 1 between the steam chest 6 and piston seat 2 and opens into the steam chest 6 under the reversing valve 10 and midway between the two 6 ports 16 and 17.

An exhaust pipe 11) is screw-tlu'eailed into the outer end of the exhaust port .18 and terms on extension thereof. A rotary piston is mounted in the piston seat 2 between the slmulders 3 and comprises a pair 01' laterally spaced heads 20 and intermediate propeller blades 21. The propeller blades 21 are cast integrally with a hub 22 and proje -t radially therefrom at right angles to each other. The heads 20 are rigidly secured to the hub 22 and closely engage the ends ol' the propeller blades 21 and form. steam tight joints thercwith. At their free edges, the propeller blades 21 a re grooved to receive spring pressed packing strips 23. 'lhese packing strips 23 engage the cylindrical surface. of the seat 2 and make steam light joints with the. surlaces they engage. A pair ol supplemental piston heads 2+1, ol larger diameter than the heads 20, are loosely mounted one on each end ol the hub 22, outside ol the heads 20, and spaced apart therefrom a sullicient distance to permit the supplemental heads 2 1 to bear against the shoulders I) and form steam tight joints therewith. The snp plemcntal heads 2 1 are adjustably and detachably secured to the piston heads 20 by a pair of long nuttcd bolts 25 passed through the heads 20 and By adjusting the nuts on the bolts 25, it is evident that the supplemental heads 24 may be made to hear more or less against the shoulders 3. The supplemental heads 21 also hold the rotary piston in working position and prevent endwise movement thereof. A power transmission shal't 26 works through a stulling box 27 in the right hand cylinder 24 with respect to Fig. 2, and its inner end, is rigidly secured to the adjacent end 01'' the. hub 22.

\Vhen the reversing valve '10 is in the position as indicated. in Fig. 1, steam will be blown through the port 16 and against the propeller blades 21 and the rotary piston rotatcd in the direction of the arrow marked on Fig. 1. When the reversing valve. 10 is moved into a position reverse from that shown in Fig. 1, the rotary piston will be rotated in a direction reverse from that indicated by the arrow marked on Fig. 1.

lVhat I claim is:

1. In a rotary engine, the combination with a casing having a piston seat, the ends of which are formed with stop shoulders, an admission port and an exhaust port, of a retary piston mounted in said seat and com prising a pair of laterally spaced heads and intermediate propeller blades, and a pair of supplemental piston heads secured one to each end of said piston for cooperation with said stop shoulders, substantially as described.

2. In a rotary engine, the combination with a casing having a piston seat, the ends of which are formed with step shoulders, an admission port and an exhaust port, of a rotary piston mounted in said seat and comprising a pair of laterally spaced heads and intermediate propeller blades, and a pair of supplemental piston heads secured one to each end of said piston for cooperation with said stop shoulders and at least one of said supplemental heads bein adjustable with respect to said piston, substantially as described.

3. In a rotary engine, the combination with a casing having a piston seat, an admission port, an exhaust port and a detachable head, the ends or" said piston seat being enlarged to form annular stop shoulders, of a rotary piston mounted in said seat and comprising a pair of laterally spaced heads and intermediate propeller blades, a shaft mounted in said casing and secured to said rotary piston, and a pair of supplemental piston heads adjustably secured to said rotary piston for cooperation with said stop shoulders, substantially as described.

4. In a rotary engine, the combination with a casing having a piston seat, an admission port, an exhaust port and a detachable head, the ends of said piston seat being enlarged to form annular stop shoulders, of a rotary piston mounted in said seat and comprising a pair of laterally spaced heads and intermediate propeller blades, sprin g-pressed packing strips mounted in the edges of said propeller blades, a shaft mounted in said casing and secured to said rotary piston, and a pair of supplemental piston heads adjustably secured to said rotary piston for cooperation with said stop shoulders, substantially as described.

5. In a rotary engine, the combination With a casing having a steam chest, a piston seat, the ends of which are formed with stop shoulders, an admission port and an exhaust port connecting said steam chest and said piston seat, and a reversing valve mounted in said steam chest, of a rotary piston mounted in said seat and comprising a pair of laterally spaced heads and intermediate propeller blades, and a pair of supplemental piston heads secured one to each end of said piston for cooperation with said stop shoulders, substantially as described.

In testimony whereof I atlix my signature in presence of two witnesses.

FRANK D, KELLY.

l i itnesses JOHN GRIMM, H. P. Sononn. 

